Awesome

VisitorGenerator

Quick utility to generate diverse kinds of base visitors for an object hierarchy.

VisitorsGenerator generateForRootClass: YourHierarchyClassRoot
Generates multiple kinds of base visitor to inherit from to define visitor for a class hierarchy.

• AbstractVisitor: Only defines an empty visit of each object
• SubclassResponsibilityVisitor: Defines each and every visit as a subclassResponsibility method.
  Enforces the definition of each method to be able to use the visitor for the kind of objects encountered.
• SuperclassVisitor: Defines each visit will use the method for its super class as well by default.
  For example, I have several RBNodes that have all the same behavior from the point of view of the visitor, I only need to override the common superclass.

I also add the acceptVisitor: method on each class of the hierarchy.